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m
g
=
−
l
θ
{\displaystyle mg=-l\theta }
g
=
l
m
θ
{\displaystyle g={\frac {l}{m}}\theta }
d
2
d
t
2
θ
=
−
l
g
θ
{\displaystyle {\frac {d^{2}}{dt^{2}}}\theta =-{\frac {l}{g}}\theta }
θ
=
A
S
i
n
ω
t
{\displaystyle \theta =ASin\omega t}
ω
=
l
m
{\displaystyle \omega ={\sqrt {\frac {l}{m}}}}